“In 2009, as climate change became a more pressing issue for U.S. businesses, [Dan Rice] grew concerned about the coal companies in his portfolio; he wondered if climatologists knew something he didn't. Rice commissioned Atmospheric & Environmental Research (AER), a Lexington (Mass.) consultancy to synthesize the climate literature. After he sat down to read AER's 35-page report, he says, “I was humbled by how little I know—and how much uncertainty there is in the existing science.”